Score with an explanation
“Why 7 out of 10”: every factor shows how many points it adds or takes away, so you can check the sum yourself.
Best bite windows
Major and minor solunar windows, sunrise and sunset, and the best hours of the day.
Pressure and magnetic storms
3-day pressure chart with sharp changes and the NOAA geomagnetic (Kp) forecast.
Fishing journal
Log how the fish were biting and what you caught; conditions are recorded automatically.
Alerts
Optional notifications: good bite tomorrow, magnetic storm, sharp pressure change.
Your spot stays yours
Exact coordinates stay on your phone. The forecast server only gets your place rounded to about 1 km. No ads, no tracking.
Optional: sign in with Google
TellFin works without an account. If you choose “Sign in with Google”, the app asks Google only for your email address and basic profile (Google account ID). It uses them for one purpose: to back up your places and fishing journal and restore them on a new phone. TellFin does not access any other Google data, never uses it for ads or AI training, and you can delete your account in the app at any time. Details: Privacy policy.
TellFin improves your odds but doesn't guarantee a catch. Available in English, Russian, German, Polish and Spanish. Now in testing on Google Play for Android; iPhone version is planned. Weather data: Open-Meteo; geomagnetic data: NOAA SWPC.